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algorithms/mclmc.html

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@@ -678,8 +678,8 @@ <h2>Validate the choice of <span class="math notranslate nohighlight">\(\epsilon
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<h2>A more complex example<a class="headerlink" href="#a-more-complex-example" title="Link to this heading">#</a></h2>
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<p>We now consider a more complex model, of stock volatility.</p>
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<p>The returns <span class="math notranslate nohighlight">\(r_n\)</span> are modeled by a Student’s-t distribution whose scale (volatility) <span class="math notranslate nohighlight">\(R_n\)</span> is time varying and unknown. The prior for <span class="math notranslate nohighlight">\(\log R_n\)</span> is a Gaussian random walk, with an exponential distribution of the random walk step-size <span class="math notranslate nohighlight">\(\sigma\)</span>. An exponential prior is also taken for the Student’s-t degrees of freedom <span class="math notranslate nohighlight">\(\nu\)</span>. The generative process of the data is:</p>
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<div class="amsmath math notranslate nohighlight" id="equation-a747ca04-03e8-4294-8b1e-6727854cc923">
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<span class="eqno">(1)<a class="headerlink" href="#equation-a747ca04-03e8-4294-8b1e-6727854cc923" title="Permalink to this equation">#</a></span>\[\begin{align}
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<div class="amsmath math notranslate nohighlight" id="equation-e3299d63-945c-4671-a2f2-693b75665e3e">
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<span class="eqno">(1)<a class="headerlink" href="#equation-e3299d63-945c-4671-a2f2-693b75665e3e" title="Permalink to this equation">#</a></span>\[\begin{align}
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&amp;r_n / R_n \sim \text{Student's-t}(\nu) \qquad
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&amp;&amp;\nu \sim \text{Exp}(\lambda = 1/10) \\ \nonumber
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&amp;\log R_n \sim \mathcal{N}(\log R_{n-1}, \sigma) \qquad

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